Sail the Tobago Cays

Oceanic island off Borneo ranked among the best dive sites on Earth — turtles, barracuda tornadoes, reef sharks.

Dazzling turquoise South Pacific lagoon.

Granite-boulder islands in the Andaman Sea with some of Thailand’s clearest water and best coral.

Turtle-rich reefs off Moheli.

Laid-back pair of jungle islands with clear water and cheap beachfront snorkelling.

Three tiny car-free islands off Lombok — turtles, reef bars and no traffic at all.

The planet's richest coral reefs.

Uninhabited island with crystal water.